Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Server Fault. Closed 9 years ago. Improve this question I have interest issue. I want to work with SAN storage via two Fibre Chanel with using multypath. And I want to use … Read more
DM-Multipath document says that multipathd support active/active clusters with some policies such as round-robin. However, there is some racing problem in this kind of clusters. For example, assume there is a client who is connected to a disk in SAN storage through two separate SAN switches. If the client writes X and Y in the … Read more
I have one /storage partition which is created from /dev/sdc local disk which is in LVM, now i want to extend it. we have 1 disk free which is a multipath disk over iscsi. can i add this disk in the existing LVM? will there be any issue when server reboots? Thank you Answer can … Read more
I use two Q-Logic HBA’s on one server which have access to the same LUN. Red Hat (and gparted also) sees the LUN as two seperate disks (sda, sdb). Is this normal? Thanks! Answer I didn’t configure multipathing. The most simple wat is to install Red Hat using “linux mpath” options. AttributionSource : Link , … Read more
This seems to be a semi-common issue asked, but I have not yet found a good solution. I try the following: [root@localhost ~]# pvcreate /dev/sdc Can’t open /dev/sdc exclusively. Mounted filesystem? This forum post shows the user’s solution to have been to boot off a different image, modify his LVM groups, and then restart normally. … Read more
Actually we have a server with Oracle Linux 5.8 in which we present clones of production LUN and then we open a clone of the database for several querys. The problem begin when we execute this command to find the new cloned LUN find /sys/class/scsi_host/host*/scan | while read line; do echo – – – > … Read more
I would like to set up a server, that uses several SOCKS Proxys as uplink to the internet. All Multipath setups I found were about using “normal” uplink like LAN, Cable or DSL, but none that uses SOCKS proxys. Has anyone ever done that or can point me to the right direction on how to … Read more
I have set up a RAW mapped storage device which is shared between 3 VMs. In the guest OSs the disk shows up fine but when I try to set up multipathing I can only see one path. In the virtual machine properties when I select the new (raw mapped lun) disk and hit “manage … Read more
I have a bare metal server running on Softlayer. It has many Consistent Performance iSCSI storage devices attached in a multipath configuration. One of the devices, represented by /dev/sdaa1 and /dev/sdab1, is not showing up as a multipath device under /dev/mapper. How can I make it show up? Answer The problem was that the multipath … Read more
I have setup a server (CentOS) on which I have connected to several LUNs from a SAN via iSCSI then multipath, resulting in multiple physical volumes I can use for LVM (dm1 …). From the file server, I have then used these physical volumes to setup two logical volumes which I then serve to a … Read more
